pack: add test for M\ object >n-byte-array.
pack: add test for M\ object >n-byte-array.

factor/factor,mrjbq7/factor,AlexIljin/factor,mrjbq7/factor,factor/factor,bpollack/factor,bpollack/factor,AlexIljin/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,factor/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,bpollack/factor,factor/factor,factor/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,tgunr/factor,tgunr/factor,tgunr/factor,AlexIljin/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,tgunr/factor,AlexIljin/factor